TWI753335B - Laminated iron core, iron core block, rotating electrical machine, and manufacturing method of iron core block - Google Patents

Abstract

One aspect of the present invention is a laminated core comprising: a plurality of electromagnetic steel sheets stacked on each other; and a plurality of bonding portions disposed between the electromagnetic steel sheets adjacent to each other in the stacking direction, and the electromagnetic steel sheets are respectively attached to each other. Adhered to each other, and viewed from the lamination direction, a plurality of the above-mentioned bonding parts are formed in a strip shape each extending in the first direction, and the plurality of the above-mentioned bonding parts are mutually aligned in a second direction orthogonal to the above-mentioned first direction. And it arrange|positions so that the angle which the said 1st direction and the rolling direction of the said electromagnetic steel sheet form is 30 degrees or more and 90 degrees or less.

Description

Laminated iron core, iron core block, rotating electrical machine, and manufacturing method of iron core block

The present invention relates to a manufacturing method of a laminated iron core, an iron core block, a rotating electric machine and an iron core block. This application is based on Japanese Patent Application No. 2018-235856 filed in Japan on December 17, 2018, Japanese Patent Application No. 2018-235872 filed in Japan on December 17, 2018, and Japanese Patent Application No. 2018-235872 filed in Japan on June 26, 2019 Japanese Patent Application No. 2019-118338 and Japanese Patent Application No. 2019-118339, which were filed in Japan on June 26, 2019, claim priority, and the contents thereof are incorporated herein.

A laminated iron core as described in the following Patent Document 1 has been conventionally known. In this laminated iron core, the electromagnetic steel sheets adjacent to each other in the lamination direction are bonded to each other by an adhesive layer. prior art literature Patent Literature

Patent Document 1: Japanese Patent Laid-Open No. 2011-023523

The problem to be solved by the invention

In the above-described conventional laminated iron core, there is still room for improvement in improving the magnetic properties.

The present invention has been made in view of the above-mentioned matters, and aims at improving the magnetic properties of the laminated iron core. means of solving problems

In order to solve the aforementioned problems, the present invention proposes the following means.

(1) One aspect of the present invention is a laminated iron core, comprising: a plurality of electromagnetic steel sheets, laminated to each other; and A plurality of bonding portions are arranged between the electromagnetic steel sheets adjacent to each other in the lamination direction, and respectively bond the electromagnetic steel sheets to each other, In addition, when viewed from the lamination direction, the plurality of bonding portions are formed in a strip shape each extending in the first direction, and the plurality of bonding portions are aligned and arranged in a second direction orthogonal to the first direction. The angle formed by the first direction and the rolling direction of the electrical steel sheet is 30° or more and 90° or less.

(2) In the laminated iron core described in the above (1), the angle formed by the first direction and the rolling direction of the electrical steel sheet may be 52.3° or more.

(3) In the laminated iron core described in (1) or (2) above, the following structure may be adopted: the width dimension of the bonding portion is greater than the interval dimension of the adjacent bonding portion in the second direction. smaller.

(4) In the laminated iron core described in the above (3), the following structure may be adopted: the width dimension of the bonding portion relative to the interval dimension of the adjacent bonding portion in the second direction may be 67%± 5%.

(5) In the laminated iron core described in the above (4), the angle formed by the first direction and the rolling direction of the electrical steel sheet may be 75°±5°.

(6) In the laminated iron core described in (1) or (2) above, the following configuration may be employed: the width dimension of the bonding portion is greater than the interval dimension of the adjacent bonding portion in the second direction. bigger.

(7) In the laminated iron core described in the above (6), the following structure may be adopted: the width dimension of the bonding portion relative to the interval dimension of the adjacent bonding portion in the second direction may be 167%±167%± 5%, and the angle formed by the first direction and the rolling direction of the electrical steel sheet is 85° or more.

(8) In the laminated iron core described in the above (6), the following structure may be adopted: the width dimension of the bonding portion relative to the interval dimension of the adjacent bonding portion in the second direction may be 233%± 5%, and the angle formed by the first direction and the rolling direction of the electrical steel sheet is 85° or more.

(9) One aspect of the present invention is a laminated iron core, comprising: a plurality of electromagnetic steel sheets, laminated to each other; and A plurality of bonding portions are arranged between the electromagnetic steel sheets adjacent to each other in the lamination direction, and respectively bond the electromagnetic steel sheets to each other, In addition, when viewed from the lamination direction, the plurality of bonding portions are formed in a strip shape each extending in the first direction, and the plurality of bonding portions are aligned and arranged in a second direction orthogonal to the first direction. The width dimension of the said bonding part is 368% or less with respect to the space|interval dimension of the said 2nd direction with respect to the said adjacent bonding part.

(10) In the laminated iron core described in any one of the above (1) to (9), the following configuration may be employed: the average thickness of the bonding portion is 1.0 μm to 3.0 μm.

(11) In the laminated iron core described in any one of the above (1) to (10), the following configuration may be employed: the average tensile modulus E of the bonding portion is 1500 MPa to 4500 MPa.

(12) In the laminated iron core described in any one of the above (1) to (11), the following structure may be employed: the bonding portion may be composed of an elastomer-containing acrylic adhesive containing SGA. Room temperature adhesive type acrylic adhesive.

(13) One aspect of the present invention is an iron core block, wherein a plurality of said iron core blocks are formed by annularly connecting a plurality of laminated iron cores, and comprising: a plurality of electromagnetic steel sheets, laminated to each other; and A plurality of bonding portions are arranged between the electromagnetic steel sheet sheets adjacent to each other in the lamination direction, and the electromagnetic steel sheet sheets are bonded to each other, respectively, In addition, when viewed from the lamination direction, the plurality of bonding portions are formed in a strip shape each extending in the first direction, and the plurality of bonding portions are aligned and arranged in a second direction orthogonal to the first direction. The angle formed by the first direction and the rolling direction of the electrical steel sheet is 45° or more and 90° or less.

(14) In the core block according to (13), the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet may be 52.3° or more.

(15) The core block according to (13) or (14) above may have a configuration including an arc-shaped core back and teeth protruding from the core back in the radial direction of the core back The tooth portion extends along the rolling direction.

(16) In the core block according to any one of the above (13) to (15), the following structure may be adopted: the width dimension ratio of the bonding portion and the adjacent bonding portion are in the second direction. The spacer size on is smaller.

(17) In the core block according to (16), the following structure may be adopted: the width dimension of the bonding portion is 60% or less relative to the spacing dimension of the adjacent bonding portion in the second direction .

(18) In the core block according to (17), the following structure may be adopted: the width dimension of the bonding portion is 43% or less with respect to the spacing dimension of the adjacent bonding portion in the second direction. .

(19) In the core block according to (17), the following configuration may be employed: the width dimension of the bonding portion relative to the spacing dimension of the adjacent bonding portion in the second direction is 43%± 5%, and the angle formed by the first direction and the rolling direction of the electrical steel sheet is 45° or more.

(20) In the core block described in (16), the following configuration may be adopted: the width dimension of the bonding portion relative to the interval dimension of the adjacent bonding portion in the second direction may be 60%± 5%, and the angle formed by the first direction and the rolling direction of the electrical steel sheet is 60° or more.

(21) In the core block according to any one of the above (13) to (15), the following structure may be adopted: the width dimension ratio of the bonding portion and the adjacent bonding portion are in the second direction. The spacer size on is larger.

(22) In the core block according to (21), the following structure may be adopted: the width dimension of the bonding portion is 150% ± 150% relative to the spacing dimension of the adjacent bonding portion in the second direction 5%, and the angle formed by the first direction and the rolling direction of the electrical steel sheet is 85° or more.

(23) In the core block according to any one of the above (13) to (22), the following configuration may be employed: the average thickness of the bonding portion is 1.0 μm to 3.0 μm.

(24) The core block according to any one of the above (13) to (23) may be configured such that the average tensile modulus of elasticity E of the bonding portion is 1500 MPa to 4500 MPa.

(25) In the core block according to any one of the above (13) to (24), the following structure may be employed: the bonding portion is composed of an elastomer-containing acrylic adhesive containing SGA. Room temperature adhesive type acrylic adhesive.

(26) One aspect of the present invention is a laminated iron core, wherein the laminated iron core is configured by connecting a plurality of the core blocks according to any one of the above (13) to (25) in a ring shape.

(27) An aspect of the present invention is a rotating electrical machine including the laminated iron core according to any one of the above (1) to (12) and the above (26).

(28) One aspect of the present invention is a method for manufacturing an iron core block, comprising the following steps: Step 1, punching out a plurality of electromagnetic steel sheets from the electromagnetic steel sheet; and In the second step, lamination is performed while providing a bonding portion between a plurality of the electromagnetic steel sheets. Further, in the first step, the electromagnetic steel sheet is punched so that the tooth portions extend in the rolling direction of the electromagnetic steel sheet, and in the second step, the plurality of bonding portions are formed so as to be each viewed from the lamination direction. A strip extending in the first direction, a plurality of the bonding portions are mutually aligned and arranged in a second direction orthogonal to the first direction, and a plurality of the electromagnetic steel sheets are laminated in the first direction and the The angle formed by the rolling direction is 45° or more and 90° or less.

(29) In the method of manufacturing an iron core block according to (28), the following configuration may be employed: the width dimension of the bonding portion is smaller than the interval dimension of the adjacent bonding portion in the second direction . Invention effect

According to the present invention, the magnetic properties of the laminated iron core can be improved.

Form for carrying out the invention

Hereinafter, a rotating electrical machine according to an embodiment of the present invention will be described with reference to the drawings. In addition, in the present embodiment, an electric motor, specifically an AC motor, more specifically a synchronous motor, and still more specifically a permanent magnet field type motor is given as an example of the rotating electrical machine and described. Such an electric motor can be conveniently employed in, for example, an electric vehicle or the like.

(first embodiment) First, the rotating electrical machine 10 of the first embodiment will be described with reference to FIGS. 1 to 4 . As shown in FIGS. 1 and 2 , the rotating electrical machine 10 according to the first embodiment includes a stator 20 , a rotor 30 , a casing 50 , and a rotating shaft 60 . The stator 20 and the rotor 30 are accommodated in the casing 50 . The stator 20 is fixed to the casing 50 .

In the rotating electrical machine 10 of the present embodiment, for example, an excitation current of 10A effective value and a frequency of 100Hz can be applied to each phase of the stator 20, and the rotor 30 and the rotating shaft 60 are rotated at 1000 rpm along with this.

In the present embodiment, as the rotating electrical machine 10, an inner rotor type in which the rotor 30 is located inside the stator 20 is used. However, as the rotating electrical machine 10, an outer rotor type in which the rotor 30 is located outside the stator 20 may also be employed. In addition, in the present embodiment, the rotating electrical machine 10 is a three-phase AC motor with 12 poles and 18 slots. However, for example, the number of poles or slots, the number of phases, and the like can be appropriately changed.

The stator 20 includes a stator core (laminated core) 21 and windings not shown. The stator iron core 21 of this embodiment is an integral iron core. The stator core 21 includes an annular core back 22 and a plurality of teeth 23 . Hereinafter, the axial direction of the stator core 21 (the core back 22 ) (the direction of the central axis O of the stator core 21 ) is referred to as the axial direction, and the radial direction (orthogonal to the stator) of the stator core 21 (the core back 22 ) is referred to as the axial direction. The direction of the central axis O of the iron core 21 is referred to as the radial direction, and the circumferential direction of the stator iron core 21 (core back 22 ) (the direction surrounding the central axis O of the stator iron core 21 ) is referred to as the circumferential direction.

In a plan view of the stator 20 viewed from the axial direction, the core back 22 is formed in an annular shape. The plurality of teeth 23 protrude from the core back 22 toward the inner side in the radial direction (along the radial direction and toward the center axis O of the core back 22 ). The plurality of teeth 23 are arranged at equal intervals in the circumferential direction. In the present embodiment, 18 tooth portions 23 are provided at intervals of 20 degrees with a central angle centered on the central axis O. The plurality of tooth portions 23 are formed to have the same shape and the same size as each other. The aforementioned windings are wound around the teeth 23 . The aforementioned windings can be either concentrated winding or distributed winding.

The rotor 30 is arranged radially inward with respect to the stator 20 (stator iron core 21 ). The rotor 30 includes a rotor core 31 and a plurality of permanent magnets 32 . The rotor core 31 is formed in an annular shape (an annular shape) arranged coaxially with the stator 20 . Inside the rotor core 31, the aforementioned rotating shaft 60 is arranged. The rotating shaft 60 is fixed to the rotor core 31 . The plurality of permanent magnets 32 are fixed to the rotor core 31 . In the present embodiment, two permanent magnets 32 in one set are formed with one magnetic pole. The plural sets of permanent magnets 32 are arranged at equal intervals in the circumferential direction. In the present embodiment, 12 sets (24 as a whole) of permanent magnets 32 are provided at intervals of 30 degrees with a central angle centered on the central axis O.

In the present embodiment, a magnet embedded type motor is used as the permanent magnet field type motor. The rotor core 31 is formed with a plurality of through holes 33 penetrating the rotor core 31 in the axial direction. The plurality of through holes 33 are provided corresponding to the plurality of permanent magnets 32 . The permanent magnets 32 are fixed to the rotor core 31 in a state of being arranged in the corresponding through holes 33 . The fixing of the permanent magnets 32 to the rotor core 31 can be achieved by, for example, bonding the outer surface of the permanent magnet 32 and the inner surface of the through hole 33 with an adhesive or the like. Furthermore, a surface magnet type motor may be used as the permanent magnet field type motor instead of the embedded magnet type motor.

＜Laminated iron core＞ As shown in FIG. 3 , the stator core 21 is a laminated core. The stator core 21 is formed by laminating a plurality of electromagnetic steel sheets 40 . That is, the stator core 21 includes a plurality of electromagnetic steel sheets 40 laminated in the thickness direction.

In addition, the lamination|stacking thickness of the stator core 21 is set to 50.0 mm, for example. The outer diameter of the stator core 21 is, for example, 250.0 mm. The inner diameter of the stator core 21 is set to, for example, 165.0 mm. However, these values are examples, and the lamination thickness, outer diameter, or inner diameter of the stator core 21 are not limited to these values. Here, the inner diameter of the stator iron core 21 is based on the front end portion of the tooth portion 23 in the stator iron core 21 . The inner diameter of the stator core 21 is the diameter of an imaginary circle inscribed in the tip portions of all the teeth 23 .

Each of the electromagnetic steel sheets 40 forming the stator core 21 is formed by, for example, punching a rolled plate-shaped base material or the like. As the electromagnetic steel sheet 40, a known electromagnetic steel sheet can be used. The chemical composition of the electrical steel sheet 40 is not particularly limited. In the present embodiment, a non-oriented electrical steel sheet is used as the electrical steel sheet 40 . As the non-oriented electrical steel sheet, for example, a non-oriented electrical steel strip of JIS C 2552:2014 can be used. However, instead of the non-oriented electrical steel sheet, a grain-oriented electrical steel sheet may be used as the electrical steel sheet 40 . As the grain-oriented electrical steel sheet, for example, the grain-oriented electrical steel strip of JIS C 2553:2012 can be used.

The maximum value of the anisotropy of the iron loss of the non-oriented electrical steel strip is smaller than the threshold value specified by JIS, and the iron loss has no obvious directionality. However, since the non-oriented electrical steel strip is a rolled sheet, it has a directionality of iron loss below the threshold value specified by JIS along the rolling direction. Likewise, grain-oriented electrical steel strips have the smallest iron loss in the rolling direction. Therefore, both the non-oriented electric steel strip and the oriented electric steel strip have smaller iron losses in the rolling direction than in other directions.

In the present embodiment, the rolling directions of the plurality of electromagnetic steel sheets 40 forming the stator core 21 coincide with each other. As described above, the electromagnetic steel sheet 40 has the smallest iron loss in the rolling direction. Therefore, the stator core 21 has the most excellent magnetic properties in the rolling direction of the electrical steel sheet 40 .

In order to improve the workability of the electrical steel sheet and the iron loss of the laminated core, insulating films are provided on both surfaces of the electrical steel sheet 40 . As the material constituting the insulating film, for example, (1) inorganic compounds, (2) organic resins, and (3) mixtures of inorganic compounds and organic resins can be used. Examples of inorganic compounds include (1) complexes of dichromate and boric acid, (2) complexes of phosphates and silica, and the like. Examples of the organic resin include epoxy resins, acrylic resins, acrylic styrene resins, polyester resins, silicone resins, and fluorine resins.

In order to secure the insulating performance between the electromagnetic steel sheets 40 stacked on each other, the thickness of the insulating coating (thickness per single side of the electromagnetic steel sheets 40 ) is preferably 0.1 μm or more. On the other hand, the insulating effect saturates as the insulating film becomes thicker. In addition, as the insulating film becomes thicker, the ratio of the insulating film in the stator core 21 increases, and the magnetic properties of the stator core 21 decrease. Therefore, it is preferable that the insulating film is thin within a range in which insulating performance can be ensured. The thickness of the insulating film (thickness per surface of the electrical steel sheet 40 ) is preferably 0.1 μm or more and 5 μm or less, and preferably 0.1 μm or more and 2 μm or less.

As the electromagnetic steel sheet 40 becomes thinner, the effect of improving the iron loss is gradually saturated. Also, as the electromagnetic steel sheet 40 becomes thinner, the manufacturing cost of the electromagnetic steel sheet 40 increases. Therefore, considering the improvement effect of iron loss and the manufacturing cost, the thickness of the electromagnetic steel sheet 40 is preferably set to 0.10 mm or more. On the other hand, if the electromagnetic steel sheet 40 is too thick, the pressing and punching operation of the electromagnetic steel sheet 40 becomes difficult. Therefore, considering the pressing and punching operation of the electromagnetic steel sheet 40, the thickness of the electromagnetic steel sheet 40 is preferably set to be 0.65 mm or less. In addition, when the electromagnetic steel sheet 40 is thickened, the iron loss increases. Therefore, considering the iron loss characteristics of the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.35 mm or less, and preferably 0.20 mm or 0.25 mm. Considering the above points, the thickness of each electromagnetic steel sheet 40 may be, for example, 0.10 mm or more and 0.65 mm or less, preferably 0.10 mm or more and 0.35 mm or less, and more preferably 0.20 mm or 0.25 mm. In addition, the thickness of the insulating film is also included in the thickness of the electrical steel sheet 40 .

The plurality of electromagnetic steel sheets 40 forming the stator core 21 are bonded by the bonding portion 41 . The adjoining part 41 is provided between the electromagnetic steel sheets 40 adjacent to each other in the lamination direction, and is an adhesive that has been hardened without being broken. As the adhesive, for example, a polymer-bonded thermosetting adhesive or the like can be used. As the composition of the adhesive, (1) acrylic resin, (2) epoxy resin, (3) composition containing acrylic resin and epoxy resin, etc. are applicable. As the above-mentioned adhesive, in addition to the thermosetting adhesive, a radical polymerization type adhesive or the like may be used, but from the viewpoint of productivity, it is desirable to use a room temperature hardening adhesive. The room temperature hardening adhesive is hardened at 20℃~30℃. As a room temperature hardening type adhesive, an acrylic adhesive is suitable. Typical acrylic adhesives include SGA (Second Generation Acrylic Adhesive) and the like. Any of an anaerobic adhesive, an instant adhesive, and an elastomer-containing acrylic adhesive may be used within a range that does not lose the effect of the present invention. In addition, the adhesive agent here means the state before hardening, and it becomes the adhesive part 41 after hardening of the adhesive agent.

The average tensile modulus of elasticity E at normal temperature (20° C. to 30° C.) of the adhesive portion 41 is in the range of 1500 MPa to 4500 MPa. When the average tensile elastic modulus E of the bonding portion 41 is less than 1500 MPa, the following inconvenience occurs: the rigidity of the laminated iron core decreases. Therefore, the lower limit value of the average tensile elastic modulus E of the bonding portion 41 is preferably 1500 MPa, and preferably 1800 MPa. Conversely, when the average tensile modulus E of the bonding portion 41 exceeds 4500 MPa, the following problem occurs: the insulating film formed on the surface of the electrical steel sheet 40 is peeled off. Therefore, the upper limit value of the average tensile elastic modulus E of the bonding portion 41 is preferably 4500 MPa, and preferably 3650 MPa. In addition, the average tensile elastic modulus E was measured by the resonance method. Specifically, the tensile modulus of elasticity was measured according to JIS R 1602:1995. More specifically, first, a sample (not shown) for measurement is prepared. This sample is obtained by bonding between two electrical steel sheets 40 with an adhesive to be measured and hardening to form a bonding portion 41 . When the adhesive is a thermosetting type, this curing is performed by heating and pressing under the heating and pressing conditions in practice. On the other hand, when the adhesive is a room temperature curing type, it is performed by pressing at room temperature. Then, the tensile modulus of elasticity of this sample was measured by a resonance method. As described above, the method for measuring the tensile modulus of elasticity by the resonance method is based on JIS R 1602:1995. Then, the tensile modulus of elasticity of the bonding portion 41 alone can be obtained by removing the influence of the electrical steel sheet 40 itself from the tensile modulus of elasticity (measured value) of the sample by calculation. In this way, the tensile modulus of elasticity obtained from the sample becomes equal to the average value of the entire laminated core, so this value is regarded as the average tensile modulus of elasticity E. The average tensile elastic modulus E is set such that the composition is almost constant at the position of the lamination along the lamination direction or the position in the circumferential direction around the central axis of the laminated core. Therefore, the average tensile elastic modulus E can also be used as the value obtained by measuring the bonded portion 41 after curing at the upper end position of the laminated iron core.

The motor heats up when driven. Therefore, if the melting point of the bonding portion 41 is low, the bonding portion 41 is melted by the heat generated by the motor, and the shape of the bonding region 42 is changed, so that the desired effect cannot be obtained. Generally, an insulating coating (enamel) may be provided on the surface of the coil wound around the stator core 21 . The heat-resistant temperature of this coating is, for example, about 180°C. Therefore, a general motor is driven so as to be 180° C. or lower. That is, the motor can be heated up to about 180°C. In the present embodiment, the melting point of the bonding portion 41 is preferably 180° C. or higher. Further considering the safety factor including the case where there is a part where the temperature is locally high, it is more preferable that the melting point of the bonding portion 41 is 200° C. or higher.

As the bonding method, for example, a method of bonding the electrical steel sheet 40 by either or both of heating and pressure bonding after applying the adhesive to the electrical steel sheet 40 can be adopted. In addition, the heating means may be, for example, heating in a high-temperature tank or an electric furnace, or a method of directly energizing, and any means may be used.

In order to obtain stable and sufficient adhesive strength, the thickness of the adhesive portion 41 is preferably 1 μm or more. On the other hand, when the thickness of the bonding portion 41 exceeds 100 μm, the bonding force is saturated. In addition, as the bonding portion 41 becomes thicker, the occupancy rate decreases, and the magnetic properties such as iron loss of the laminated iron core decrease. Therefore, the thickness of the bonding portion 41 is preferably 1 μm or more and 100 μm or less, and more preferably 1 μm or more and 10 μm or less. In addition, in the above, the thickness of the bonding portion 41 means the average thickness of the bonding portion 41 .

The average thickness of the next portion 41 is preferably 1.0 μm or more and 3.0 μm or less. If the average thickness of the bonding portion 41 is less than 1.0 μm, a sufficient bonding force cannot be secured as described above. Therefore, the lower limit of the average thickness of the bonding portion 41 is set to 1.0 μm, preferably 1.2 μm. Conversely, if the average thickness of the bonded portion 41 is thicker than 3.0 μm, the following problems occur: the amount of strain of the electrical steel sheet 40 due to shrinkage during thermal hardening is greatly increased. Therefore, the upper limit of the average thickness of the bonding portion 41 is set to 3.0 μm, preferably 2.6 μm. The average thickness of the continuous portion 41 is the average value of the entire laminated core. The average thickness of the succeeding portion 41 is almost constant at the lamination position along the lamination direction or the circumferential position around the central axis of the lamination core. Therefore, the average thickness of the bonding portion 41 can be used as the average value of the values measured at 10 points or more in the circumferential direction at the upper end position of the laminated iron core.

In addition, the average thickness of the adhesive portion 41 can be adjusted, for example, by changing the coating amount of the adhesive. In addition, the average tensile modulus E of the bonding portion 41 can be changed, for example, in the case of a thermosetting adhesive, by changing one or both of the heating and pressurizing conditions and the type of the curing agent to be applied during bonding method, etc. to adjust.

Next, the relationship between the electromagnetic steel sheet 40 and the bonding portion 41 will be described with reference to FIG. 4 . In addition, in this specification, the direction in which the plurality of electrical steel sheets 40 are laminated is simply referred to as the lamination direction. The lamination direction corresponds to the thickness direction of the electrical steel sheet 40 . In addition, the lamination direction corresponds to the direction in which the central axis O extends.

When viewed from the lamination direction, the plurality of bonding portions 41 are formed in a stripe shape as a whole. The electrical steel sheets 40 adjacent to each other in the lamination direction are not all in contact with each other over the entire surface. These electromagnetic steel sheets 40 are all partially bonded to each other.

When viewed from the lamination direction, the plurality of bonding portions 41 are each formed in a strip shape along the first direction D1, and the bonding portions 41 are arranged and arranged at equal intervals along the second direction D2. In other words, the surface of the electrical steel sheet 40 facing the lamination direction (hereinafter referred to as the first surface of the electrical steel sheet 40 ) includes the bonding region 42 where the bonding portion 41 is provided, and the non-bonding region 43 (hair) where the bonding portion 41 is not provided. embryonic region). In addition, the bonding area|region 42 of the electromagnetic steel sheet 40 provided with the bonding part 41 means the area|region in which the hardened adhesive agent which is not cut|disconnected is provided in the 1st surface of the electromagnetic steel sheet 40. In addition, the non-bonding region 43 of the electromagnetic steel sheet 40 in which the bonding portion 41 is not provided means a region in which the adhesive that is hardened without being broken is not provided on the first surface of the electromagnetic steel sheet 40 . The following portions 41 are formed in a strip shape extending along the first direction D1, and are arranged and arranged at equal intervals along the second direction D2. Therefore, the bonding region 42 and the non-bonding region 43 of the first surface of the electrical steel sheet 40 are each formed in a strip shape extending along the first direction D1, and the bonding region 42 and the non-bonding region 43 alternate along the second direction D2 formed by arrangement. In addition, the so-called 1st direction D1 is the direction in which the adhesive part 41 formed in a strip|belt shape is extended, and corresponds to the longitudinal direction of the adhesive part 41. As shown in FIG. In addition, the so-called second direction D2 corresponds to the short-side direction of the bonding portion 41 formed in a strip shape. In addition, the first direction D1 and the second direction D2 are orthogonal to each other. In addition, in the present embodiment, the width dimension of the bonding portion 41 and the gap size between the bonding portions 41 are assumed to be uniform. In addition, in this specification, the "belt shape" as the shape in which the bonding portion 41 extends means a shape extending in one direction and having a width of 1.5% or more of the outer diameter of the stator core 21 . By setting the width of the bonding portion 41 to be 1.5% or more of the outer diameter of the stator core 21, the bonding strength of the electromagnetic steel sheets 40 can be sufficiently ensured.

The rolling direction RD of the electromagnetic steel sheet 40 is shown in FIG. 4 . In addition, let the angle formed by the 1st direction D1 and the rolling direction RD of the electrical steel sheet 40 be an angle α. Generally speaking, although two angles of magnitude can be defined as the angle formed by the two directions, the angle α refers to the smaller angle among the two angles formed by the first direction D1 and the rolling direction RD. That is, in this specification, the angle α is an angle set to 0° or more and 90° or less.

In this embodiment, the adhesive shrinks during hardening. Therefore, compressive stress is imparted to the electrical steel sheet 40 along with the hardening of the adhesive, and strain occurs on the electrical steel sheet 40 along with this. When the electrical steel sheet 40 is strained, the value of the iron loss increases, and there is a possibility that the magnetic properties of the stator core 21 may be lowered. In addition, in this specification, the state where the value of iron loss increases may be called "deterioration of iron loss".

When the bonding portion 41 is formed into a strip shape, the compressive stress applied to the electromagnetic steel sheet 40 becomes the largest in the direction in which the bonding portion 41 extends (first direction D1 ). The electrical steel sheet 40 has the highest rigidity in the direction orthogonal to the rolling direction RD, and is unlikely to be strained against compressive stress. Therefore, the strain of the electrical steel sheet 40 can be suppressed by making the angle α formed by the first direction D1 and the rolling direction RD close to 90°.

In addition, as described above, although the iron loss of the electrical steel sheet 40 is the smallest in the rolling direction RD, on the other hand, when strain occurs in the rolling direction RD, the deterioration of the iron loss becomes most pronounced. Therefore, when the first direction D1 coincides with the rolling direction RD of the electromagnetic steel sheet 40 (angle α=0°), the magnetic properties of the stator core 21 are reduced the most. Therefore, by making the angle α formed by the first direction D1 and the rolling direction RD away from 0°, the deterioration of the iron loss of the electrical steel sheet 40 can be suppressed.

In the present embodiment, by making the angle α formed by the first direction D1 and the rolling direction RD away from 0° and close to 90°, the strain of the electrical steel sheet 40 can be suppressed, and the deterioration of the iron loss of the electrical steel sheet 40 can be suppressed. . In the present embodiment, the angle α is preferably set to 30° or more and 90° or less. By setting the angle α to 30° or more and making the first direction D1 intersect at a certain angle or more with respect to the rolling direction, the influence of the compressive stress of the adhesive on the iron loss of the electrical steel sheet 40 can be suppressed, and the electrical steel sheet can be restrained. The strain of 40, as a result, can sufficiently secure the magnetic properties of the stator core 21.

The iron loss of the electromagnetic steel sheet 40 is maximized in a direction inclined at a specific angle with respect to the rolling direction RD. In this specification, the direction in which the iron loss becomes the largest is referred to as a specific direction SD. The inventors of the present invention have found that the specific direction SD of the electromagnetic steel sheet 40 is a direction inclined by 57.3° with respect to the rolling direction RD. In addition, the specific direction SD in the present embodiment is the crystal orientation of Miller index {111}>112> in the cubic crystal which is the crystal structure of the electrical steel sheet 40 . Since the magnetic steel sheet 40 originally has a large iron loss in the specific direction SD, even when strain occurs along the specific direction SD, the deterioration of the iron loss becomes relatively small. Therefore, the deterioration of the iron loss of the electrical steel sheet 40 can be suppressed as a whole by setting the direction close to the specific direction SD as the direction in which the strain occurs.

Here, the structure for suppressing the deterioration of the iron loss of the electrical steel sheet 40 is summarized. There are mainly the following two types of structures for suppressing the deterioration of the iron loss of the electrical steel sheet 40 due to the compressive stress of the adhesive. The first configuration is a configuration in which the first direction D1 is brought close to the direction orthogonal to the rolling direction RD of the electrical steel sheet 40 . In this configuration, the strain itself of the electrical steel sheet 40 is suppressed to suppress the deterioration of the iron loss. That is, in the first configuration, the angle α is preferably close to 90°. The second configuration is a configuration in which the first direction D1 is brought close to the specific direction SD of the electrical steel sheet 40 . In this configuration, the deterioration of the iron loss of the electrical steel sheet 40 with respect to the strain is suppressed. That is, in the second configuration, the angle α is preferably close to 57.3°.

The iron loss of the electrical steel sheet 40 is suppressed from deterioration due to the compressive stress of the adhesive by the above-mentioned two structures. Therefore, by setting the angle α to be between 57.3° and 90°, the effects of the two configurations described above can be respectively enjoyed. Furthermore, even if the angle α is changed by about ±5°, the iron loss does not change much. Therefore, the angle α formed by the first direction D1 and the rolling direction RD is preferably 52.3° or more and 90° or less. In addition, 57.3° can also be said to be about 60°. That is, in the present embodiment, it can be said that the angle α formed by the first direction D1 and the rolling direction RD is preferably 60° or more and 90° or less.

As shown in FIG. 4 , each of the plurality of bonding portions 41 is formed on the first surface of the electrical steel sheet 40 in the shape of a strip having a width dimension d1 along the second direction D2. Moreover, the gap corresponding to the space|interval dimension d2 is provided in the two contact parts 41 adjacent to each other in the 2nd direction D2. The interval dimension d2 is the width dimension of the non-contact region 43 . Here, the width dimension d1 of the bonding portion 41 corresponds to the width dimension of the bonding region 42 , and the spacing dimension d2 between the bonding portions 41 corresponds to the width dimension of the non-bonding region 43 .

The width dimension d1 of the next portion 41 is preferably set to 5% or less with respect to the outer diameter of the stator core 21 . By setting the width dimension d1 to be 5% or less of the outer diameter of the stator iron core 21, the electromagnetic steel sheet 40 is not locally greatly strained due to the compressive stress of the adhesive, and the iron loss of the entire electromagnetic steel sheet 40 can be suppressed. deterioration.

The width dimension d1 of the connecting portion 41 is preferably set to be smaller than the interval dimension d2 in the second direction D2 with respect to the adjacent connecting portion 41 (d1>d2). In other words, the width dimension d1 is preferably smaller than 100% relative to the space dimension d2. As described above, strain occurs in the electrical steel sheet 40 due to the compressive stress of the adhesive, and the iron loss of the electrical steel sheet 40 increases due to the strain. According to the present embodiment, by setting the width dimension d1 to be smaller than the interval dimension d2, the strain of the electrical steel sheet 40 caused by the adhesive can be suppressed, and the magnetic properties of the stator core 21 can be secured.

Preferably, the width dimension d1 of the connecting portion 41 is 67%±5% relative to the spacing dimension d2 of the adjacent connecting portion 41 . If the width dimension d1 is set too large with respect to the interval dimension d2, there is a fear that the strain of the electrical steel sheet 40 due to the compressive stress of the adhesive may become large. On the other hand, if the width dimension d1 is made too small with respect to the interval dimension d2, there is a possibility that the bonding strength of the electromagnetic steel sheets 40 may be insufficient. According to the present embodiment, by setting the width dimension d1 to 67%±5% with respect to the interval dimension d2, it is possible to ensure sufficient adhesion strength between the electromagnetic steel sheets 40 and suppress the strain of the electromagnetic steel sheets 40 to ensure the stator core. 21 Magnetic properties.

In addition, when the width dimension d1 is 67%±5% with respect to the space dimension d2, the angle α formed by the first direction D1 and the rolling direction RD is preferably 75°±5°. Thereby, the deterioration of the magnetic characteristics of the stator core 21 can be suppressed more effectively.

Next, the case where the width dimension d1 of the connecting portion 41 is larger than the interval dimension d2 with the adjacent connecting portion 41 (d1>d2) will be described. By making the width dimension d1 of the bonding part 41 larger than the space|interval dimension d2, the bonding force of the electromagnetic steel sheets 40 can be improved.

On the other hand, there is a fear that the strain of the electrical steel sheet 40 due to the compressive stress of the adhesive may become large. Therefore, when the width dimension d1 of the bonding portion 41 is set to be larger than the interval dimension d2, it is preferable to make the direction in which the bonding portion 41 extends (the first direction D1) close to the direction with high rigidity (orthogonal to the rolling direction RD). direction). More specifically, when the width dimension d1 of the bonding portion 41 is made larger than the interval dimension d2, the angle α formed by the first direction D1 and the rolling direction RD is preferably 85° or more. Thereby, the bonding force of the electromagnetic steel sheets 40 can be improved, the strain of the electromagnetic steel sheets 40 can be suppressed, and the magnetic properties of the stator core 21 can be ensured.

In the present embodiment, the rolling directions RD of all the electromagnetic steel sheets 40 forming the stator core 21 coincide with each other. However, the rolling directions RD of all the electromagnetic steel sheets 40 may not be the same. For example, the stator core 21 may be formed by rolling the electromagnetic steel sheets 40 and laminating them. As an example, the stator core in which the electromagnetic steel sheets 40 are rolled and laminated will be specifically described. In the stator core after the lamination is rotated, attention is paid to a layer of one bonding portion 41 and a set of electromagnetic steel sheets 40 sandwiching this layer. The rolling directions RD of a set of electromagnetic steel sheets 40 sandwiching the layer of the bonding portion 41 are different from each other. At this time, as long as the angle α formed by the first direction D1 and the rolling direction RD of the electromagnetic steel sheet 40 on one side of the lamination direction is included in the above-mentioned preferable angle range, and the electromagnetic steel sheet on the other side of the lamination direction The angle α formed by the rolling direction RD of the steel sheet 40 may be included in the above-mentioned preferable angle range. In addition, in the stator core formed by rotating and laminating, the first direction D1 of each layer of the bonding portion 41 provided between the electromagnetic steel sheets 40 may be different from each other.

In the present embodiment, the rotor core 31 is a laminated core like the stator core 21 . That is, the rotor core 31 includes a plurality of electromagnetic steel sheets laminated in the thickness direction. In the present embodiment, the laminated thickness of the rotor core 31 is equal to that of the stator core 21, and can be set to, for example, 50.0 mm. The outer diameter of the rotor core 31 is, for example, 163.0 mm. The inner diameter of the rotor core 31 is, for example, 30.0 mm. However, these values are examples, and the lamination thickness, outer diameter, or inner diameter of the rotor core 31 are not limited to these values.

In the present embodiment, the plurality of electromagnetic steel sheets forming the rotor core 31 are fixed to each other by the clinchers C (positioning pins, see FIG. 1 ). However, the plurality of electromagnetic steel sheets 40 forming the rotor core 31 may be bonded by the same bonding portion as the stator core 21 .

(Second Embodiment) Next, the rotating electrical machine 110 of the second embodiment will be described with reference to FIGS. 5 and 6 . As shown in FIG. 5 , the rotating electrical machine 110 of the second embodiment includes a rotor 30 , a casing 50 , a rotating shaft 60 , and a stator 120 similar to those of the first embodiment.

The stator 120 includes a stator iron core (laminated iron core) 121, a fastening ring 129, and windings (not shown).

The stator core 121 is a split core. Therefore, the stator core 121 has a plurality of core pieces (laminated cores) 124 . The plurality of core blocks 124 constitute the stator core 121 by connecting a plurality of them annularly. A fastening ring 129 may be arranged on the radially outer side of the plurality of core blocks 124 . The plurality of core blocks 124 are fixed to each other by inserting the fastening rings 129 . In addition, the structure of the stator core 121 of this embodiment is the same as that of 1st Embodiment about the dimension of each part, except the point that it is a division|segmentation core.

Next, the core block 124 will be described. The core block 124 is a form of a laminated core. The core block 124 has an arc-shaped core back portion 122 extending in the circumferential direction, and a tooth portion 123 .

In a plan view of the stator 120 viewed from the axial direction, the core back 122 is formed in an annular shape centered on the central axis O. The tooth portion 123 protrudes from the core back 122 toward the inner side in the radial direction (along the radial direction and toward the center axis O of the core back 122 ). By arranging the plurality of core blocks 124 annularly in the circumferential direction to constitute the stator core 121, the plurality of teeth 123 can be arranged at equal intervals in the circumferential direction. In the stator 120 of the present embodiment, 18 tooth portions 123 are provided at intervals of 20 degrees with the central axis O as the center. The plurality of tooth portions 123 are formed to have the same shape and the same size as each other. The aforementioned winding is wound around the teeth portion 123 . The aforementioned windings can be either concentrated winding or distributed winding.

The core block 124 is formed by stacking a plurality of electromagnetic steel sheet pieces 140 formed by punching an electromagnetic steel sheet in the axial direction. That is, the core block 124 has a plurality of electromagnetic steel sheets 140 stacked on each other. Therefore, the stator core 121 is a laminated core. Viewed from the axial direction, each of the plurality of electromagnetic steel sheet pieces 140 has a T-shape.

Each electromagnetic steel sheet 140 forming the core block 124 is formed by, for example, punching out a rolled plate-shaped base material. As the electromagnetic steel sheet 140, the same electromagnetic steel sheet as that of the first embodiment can be used.

The plurality of electromagnetic steel sheets 140 forming the core block 124 are bonded by the bonding portion 141 . As the adhesive constituting the adhesive portion 141 of the present embodiment, the same adhesive as that of the first embodiment is used.

Next, the relationship between the electromagnetic steel sheet 140 and the bonding portion 141 will be described with reference to FIG. 6 . In FIG. 6 , the connecting portion 141 is highlighted and displayed in a dot pattern. When viewed from the lamination direction, the plurality of bonding portions 141 are formed in a stripe shape as a whole. The electromagnetic steel sheets 140 adjacent to each other in the lamination direction are not bonded to each other over the entire surface, but are partially bonded to each other and fixed to each other.

Viewed from the lamination direction, the plurality of bonding portions 141 are each formed in a strip shape along the first direction D1, and the bonding portions 141 are arranged and arranged at equal intervals along the second direction D2. In other words, the surface of the electromagnetic steel sheet 140 facing the lamination direction (hereinafter referred to as the first surface of the electromagnetic steel sheet 140 ) includes the bonding region 142 where the bonding portion 141 is provided, and the non-bonding region 143 where the bonding portion 141 is not provided. (hair embryo area). In addition, the bonding region 142 of the electromagnetic steel sheet 140 in which the bonding portion 141 is provided means a region where the hardened adhesive without being cut is provided in the first surface of the electromagnetic steel sheet 140 . In addition, the non-bonding region 143 of the electromagnetic steel sheet 140 in which the bonding portion 141 is not provided means a region in which the adhesive hardened without being broken is not provided on the first surface of the electromagnetic steel sheet 140 . The following portions 141 are formed in a strip shape extending along the first direction D1, and are arranged and arranged at equal intervals along the second direction D2. Therefore, the bonding region 142 and the non-bonding region 143 of the first surface of the electromagnetic steel sheet 140 are each formed in a strip shape extending along the first direction D1, and the bonding region 142 and the non-bonding region 143 are formed along the second direction D2 Alternately arranged.

In the core block 124 of the present embodiment, the rolling direction RD of the electromagnetic steel sheet 140 is substantially parallel to the direction in which the teeth 123 extend. That is, the teeth 123 extend along the rolling direction RD. In the electromagnetic steel sheet 140, the iron loss becomes the smallest in the rolling direction RD. Since the magnetic flux flows in the direction in which the teeth 123 extend in the teeth 123 , the magnetic properties of the core block 124 can be improved by making the rolling direction RD substantially parallel to the direction in which the teeth 123 extend. In addition, "extending along" and "substantially parallel" here are regarded as not only being strictly parallel, but also including the case of extending in parallel within a range of ±5°. That is, in this embodiment, the angle formed by the extending direction of the teeth portion 123 and the rolling direction RD is within 5°.

In FIG. 6 , the angle α formed by the first direction D1 and the rolling direction RD of the electromagnetic steel sheet 140 is shown. As in the above-described embodiment, the electrical steel sheet 140 has the highest rigidity in the direction orthogonal to the rolling direction RD, and is unlikely to be strained against compressive stress. Therefore, the strain of the electrical steel sheet 140 can be suppressed by making the angle α formed by the first direction D1 and the rolling direction RD close to 90°.

In addition, as described above, although the iron loss of the electromagnetic steel sheet 140 is the smallest in the rolling direction RD, on the other hand, when strain occurs in the rolling direction RD, the deterioration of the iron loss becomes the most significant. Therefore, when the first direction D1 coincides with the rolling direction RD of the electromagnetic steel sheet 140 (angle α=0°), the magnetic properties of the core block 124 are reduced to the greatest extent. Therefore, by making the angle α formed by the first direction D1 and the rolling direction RD away from 0°, the deterioration of the iron loss of the electromagnetic steel sheet 140 can be suppressed.

In the present embodiment, by making the angle α formed by the first direction D1 and the rolling direction RD away from 0° and close to 90°, the strain of the electromagnetic steel sheet 140 can be suppressed, and the iron loss of the electromagnetic steel sheet 140 can be suppressed. deterioration.

In the present embodiment, the angle α is preferably set to 45° or more and 90° or less. By setting the angle α to be 45° or more and making the first direction D1 intersect at a certain angle or more with respect to the rolling direction, the influence of the compressive stress of the adhesive on the iron loss of the electromagnetic steel sheet 140 can be suppressed, and the electromagnetic steel sheet 140 can be suppressed. The strain of the steel sheet 140, as a result, can sufficiently secure the magnetic properties of the core block 124.

Since the magnetic steel sheet 140 originally has a large iron loss in the specific direction SD, even when strain occurs along the specific direction SD, the deterioration of the iron loss becomes relatively small. Therefore, by setting the direction close to the specific direction SD as the direction in which the strain occurs, the deterioration of the iron loss of the electrical steel sheet 140 can be suppressed as a whole.

Here, the structure for suppressing the deterioration of the iron loss of the electromagnetic steel sheet 140 is summarized. There are mainly the following two types of structures for suppressing the deterioration of the iron loss of the electrical steel sheet 140 due to the compressive stress of the adhesive. The first configuration is a configuration in which the first direction D1 is brought close to the direction orthogonal to the rolling direction RD of the electromagnetic steel sheet 140 . In this configuration, the strain itself of the electromagnetic steel sheet 140 is suppressed to suppress the deterioration of the iron loss. That is, in the first configuration, the angle α is preferably close to 90°. The second configuration is a configuration in which the first direction D1 is brought close to the specific direction SD of the electromagnetic steel sheet 140 . In this configuration, the deterioration of the iron loss of the electromagnetic steel sheet 140 with respect to the strain is suppressed. That is, in the second configuration, the angle α is preferably close to 57.3°.

The iron loss of the electromagnetic steel sheet 140 is suppressed from the deterioration due to the compressive stress of the adhesive by the above-mentioned two structures. Therefore, by setting the angle α to be between 57.3° and 90°, the effects of the two configurations described above can be respectively enjoyed. Furthermore, since the iron loss does not change much even if the angle α is changed by about ±5°, the angle α formed by the first direction D1 and the rolling direction RD is preferably 52.3° or more and Below 90°. In addition, since 57.3° can also be said to be about 60°, in the present embodiment, it can also be said that the angle α formed by the first direction D1 and the rolling direction RD is preferably 60° or more and 90° or less.

Each of the plurality of bonding portions 141 is formed in the shape of a strip having a width dimension d1 along the second direction D2 on the first surface of the electromagnetic steel sheet 140 . Moreover, the gap corresponding to the space|interval dimension d2 is provided in the 2 contact parts 141 mutually adjacent to each other in the 2nd direction D2. The interval dimension d2 is the width dimension of the non-contact region 143 . Here, the width dimension d1 of the bonding portion 141 corresponds to the width dimension of the bonding region 142 , and the space dimension d2 between the bonding portions 141 corresponds to the width dimension of the non-bonding region 143 .

The width dimension d1 of the next portion 141 is preferably set to 5% or less with respect to the outer diameter of the stator core 121 . By setting the width dimension d1 to be 5% or less of the outer diameter of the stator core 121, the electromagnetic steel sheet 140 is not locally deformed due to the compressive stress of the adhesive, and the iron of the entire electromagnetic steel sheet 140 can be suppressed. damage deterioration.

The width dimension d1 of the connecting portion 141 is preferably set to be smaller than the space dimension d2 between the adjacent connecting portion 141 in the second direction D2 (d1>d2). In other words, the width dimension d1 is preferably smaller than 100% relative to the space dimension d2. As described above, strain occurs in the electromagnetic steel sheet 140 due to the compressive stress of the adhesive, and the iron loss of the electromagnetic steel sheet 140 increases due to this strain. According to the present embodiment, by setting the width dimension d1 to be smaller than the interval dimension d2, the strain of the electromagnetic steel sheet 140 caused by the adhesive can be suppressed, and the magnetic properties of the core pieces 124 can be secured.

Preferably, the width dimension d1 of the adjoining portion 141 is 60% or less relative to the space dimension d2 of the adjoining adjoining portion 141 . Thereby, the strain of the electromagnetic steel sheet 140 caused by the adhesive can be suppressed more reliably, and the magnetic properties of the core block 124 can be ensured. Also, for the same reason, it is preferable that the width dimension d1 of the bonding portion 141 is equal to or less than 43% of the distance dimension d2 between the bonding portion 141 and the adjacent bonding portion 141 .

Next, the case where the width dimension d1 of the connecting portion 141 is larger than the interval dimension d2 with the adjacent connecting portion 141 (d1>d2) will be described. By making the width dimension d1 of the bonding portion 141 larger than the interval dimension d2, the bonding force between the electromagnetic steel sheets 140 can be improved.

On the other hand, there is a fear that the strain of the electromagnetic steel sheet 140 due to the compressive stress of the adhesive may become large. Therefore, when the width dimension d1 of the bonding portion 141 is set larger than the interval dimension d2, it is preferable to make the direction in which the bonding portion 141 extends (first direction D1) close to the direction with high rigidity (orthogonal to the rolling direction RD). direction). More specifically, when the width dimension d1 of the bonding portion 141 is set to be larger than the interval dimension d2, the angle α formed by the first direction D1 and the rolling direction RD is preferably 85° or more. Thereby, the adhesive force of the electromagnetic steel sheet 140 can be improved, the strain of the electromagnetic steel sheet 140 can be suppressed, and the magnetic properties of the core blocks 124 can be ensured.

Next, the manufacturing method of the core block 124 and the stator core 121 of this embodiment is demonstrated. The manufacturing method of the core block 124 mainly includes a first step and a second step.

First, as a first step, a plurality of T-shaped electromagnetic steel sheet pieces 140 are punched out from the rolled electromagnetic steel sheet. In the first step, the electromagnetic steel sheet 140 is punched so that the teeth extend along the rolling direction RD of the electromagnetic steel sheet.

Next, as a second step, lamination is performed while providing the bonding portion 141 between the plurality of electromagnetic steel sheets 140 . In the second step, the plurality of bonding portions 141 are formed into strips each extending in the first direction D1 when viewed from the lamination direction. In addition, the plurality of bonding portions 141 are mutually aligned and arranged in the second direction D2. In addition, a plurality of electrical steel sheet sheets 140 are stacked so that the angle formed between the first direction D1 and the rolling direction RD is 45° or more and 90° or less. The plurality of electromagnetic steel sheets 140 can be fixed to each other by hardening the adhesive portion 141 .

(Variation) Next, with reference to FIG. 7, the connection part 241 of the modification which can be employ|adopted in each embodiment mentioned above is demonstrated. In addition, the same code|symbol is attached|subjected to the component which is the same aspect as the above-mentioned embodiment, and the description is abbreviate|omitted.

Similar to the above-described embodiment, a plurality of bonding portions 241 are provided between the electromagnetic steel sheets 40 (or the electromagnetic steel sheet pieces 140 ) of this modification. Each of the bonding portions 241 is formed in a band shape along the first direction D1 on the first surface of the electrical steel sheet 40 when viewed from the lamination direction. In addition, the plurality of bonding portions 241 are arranged at equal intervals along the second direction D2. The two adjoining parts adjacent to each other in the second direction D2 are spaced apart and arranged corresponding to the interval dimension d2.

The bonding portion 241 of this modification has a plurality of element bonding portions 241c arranged along the first direction D1. In the present embodiment, the element bonding portion 241c refers to a block of adhesives that are arranged in plural along the first direction D1 to constitute the bonding portion 241 . The plurality of adhesives have substantially the same shape as each other. The adjacent element connecting portions 241c are connected to each other in the first direction D1. When viewed from the stacking direction, each element bonding portion 241c has a substantially elliptical shape with the first direction D1 as the major axis. Therefore, both end portions in the width direction of the bonding portion 241 extend in a curved manner along the first direction D1. The element bonding portion 241c may have a substantially circular shape or the like in addition to the substantially elliptical shape shown in this modification example. As shown in the present modification, the "bonding portion extending in a strip shape" in this specification may mean that both ends in the width direction are not necessarily linear, but are curved along the first direction D1.

The continuous portion 241 extends along the center line CL with the center line CL parallel to the first direction D1 as the center. The continuous portion 241 has a symmetrical shape centered on the center line CL.

As shown in the present modification, when both end portions in the width direction of the bonding portion 241 are bent and extended, the definition of the width dimension d1 of the bonding portion 241 may be as follows. That is, the imaginary line VL that is approximately straight is set at both ends in the width direction of the bonding portion 241 to define the width dimension d1 of the bonding portion 241 . The imaginary line VL extends substantially parallel to the center line CL. The pair of imaginary lines VL is an imaginary straight line defined so that the area of the region sandwiched by the pair of imaginary lines VL becomes equal to the area of the joining portion 241 viewed from the stacking direction.

In the present modification, the width dimension d1 of the bonding portion 241 is the distance dimension along the second direction D2 of the pair of imaginary lines VL. In addition, in this modification, the space|interval dimension d2 is the distance dimension between the virtual lines VL of the adjacent connection parts 241.

The bonding portion 241 shown in this modification can exhibit the same effects as the bonding portion 41 in the above-described embodiment. Such an adhesive portion 241 is formed, for example, by applying an adhesive agent to a plurality of spots along the first direction D1 on the electromagnetic steel sheet 40 from a plurality of dispensers, and then pressing the electromagnetic steel sheet 40 to other positions. The electromagnetic steel sheet 40 and the adhesive is compressed between the two electromagnetic steel sheets 40 . In this way, even when the width dimension of the bonding portion 241 becomes non-uniform, the same effect as that of the above-described embodiment can be obtained.

In addition, the technical scope of the present invention is not limited to the above-described embodiments and their modifications, and various modifications can be added without departing from the gist of the present invention.

In each of the above-described embodiments, the case where the bonding portion is provided over the entire area within the surface of the electromagnetic steel sheet 40 or the electromagnetic steel sheet sheet 140 has been described. However, the adhesive portion may be partially provided in the surface of the electromagnetic steel sheet 40 or the electromagnetic steel sheet 140 . As an example, a striped joint portion may be provided only in a region overlapping with the core back of the electromagnetic steel sheet. Moreover, you may provide the stripe-shaped joining part only in the area|region which overlaps with the tooth part of an electromagnetic steel sheet.

The shape of the stator core is not limited to the one shown in each of the above-mentioned embodiments. Specifically, the dimensions of the outer diameter and inner diameter of the stator core, the thickness of the laminate, the number of slots, the dimension ratio between the circumferential direction and the radial direction of the tooth portion, and the dimension ratio between the tooth portion and the back of the core in the radial direction, etc., can be adapted to It can be arbitrarily designed according to the desired characteristics of the rotating electrical machine.

In addition, in the core block 124 of the second embodiment, a convex shape may be provided on one end face in the circumferential direction of the core back 122, and a concave shape may be provided on the other end face in the circumferential direction. At this time, by inserting the convex shape into the concave shape, the positional displacement at the time of connecting the plurality of core pieces 124 in the circumferential direction can be suppressed. In addition, the iron core block may have two or more teeth with respect to one core back. In addition, it can also be that the core back and the teeth are separate iron core blocks.

In the rotor of each of the above-described embodiments, one magnetic pole is formed of two permanent magnets 32 in one set, but the present invention is not limited to this. For example, one magnetic pole may be formed for one permanent magnet 32 , or one magnetic pole may be formed for three or more permanent magnets 32 .

In each of the above-mentioned embodiments, the permanent magnet magnetic field type motor has been described as an example of the rotating electrical machine. However, as exemplified below, the structure of the rotating electrical machine is not limited to this, and it is also possible to use a structure that is not exemplified below. various well-known structures. In each of the above-described embodiments, the permanent magnet field type motor is described as an example of the synchronous motor, but the present invention is not limited to this. For example, the rotating electrical machine may be a reluctance type motor or an electromagnet field type motor (field winding type motor). In each of the above-mentioned embodiments, the synchronous motor was taken as an example and described as an AC motor, but the present invention is not limited to this. For example, the rotating electrical machine may also be an induction motor. In each of the above-described embodiments, an AC motor is given as an example and described as an electric motor, but the present invention is not limited to this. For example, the rotating electrical machine may also be a DC motor. In each of the above-described embodiments, the electric motor is described as an example of the rotating electrical machine, but the present invention is not limited to this. For example, the rotating electrical machine may also be a generator.

In each of the above-mentioned embodiments, the case where the laminated iron core of the present invention is applied to the stator iron core is exemplified, but it can also be applied to the rotor iron core. Moreover, the laminated iron core of this invention can also be applied to laminated iron cores other than rotating electrical machines, such as a transformer.

In addition, within the scope of not departing from the gist of the present invention, the constituent elements in the above-described embodiments may be appropriately converted into well-known constituent elements, and the aforementioned modification examples may be appropriately combined. [Example]

Next, a verification test for verifying the above-mentioned effect was carried out. Verification tests are carried out by simulations using software. The software used is the finite element method electromagnetic field analysis software JMAG made by JSOL Corporation.

>The first verification test> First, as the first verification test, the one-piece core exemplified as the first embodiment was verified. As models used for the simulation, stator cores (laminated cores) of model numbers A1 to A22 described below are assumed. The electromagnetic steel sheet used in each model is a non-oriented electromagnetic steel sheet with a thickness of 0.25mm. The shape of the electromagnetic steel sheet is the same as that shown in FIG. 2 .

In the stator cores of model numbers A1 to A21, a plurality of bonding portions as shown in FIG. 4 are provided between the electromagnetic steel sheets. That is, in the stator cores of the model number A1 to the model number A21, the plurality of bonding portions extend in a strip shape along the first direction D1. On the other hand, in the stator core of the model number A22, between the electromagnetic steel sheets, the bonding portion was provided on the entire surface of the first surface of the electromagnetic steel sheets. That is, the adjoining part of the model number A22 is provided in the whole surface of the 1st surface of an electromagnetic steel sheet. The stator core of model number A22 is a model prepared for obtaining the reference value of iron loss. Hereinafter, the stator core of the model number A22 will be referred to as a "reference model".

Let the stator cores of model numbers A1 to A7 be the models of the A1 group. In the model of the A1 group, the width dimension d1 of the bonding portion is 233% with respect to the spacing dimension d2 of the adjacent bonding portion. The width dimension d1 of the bonding portion of each model of the A1 group is 7 mm, and the spacing dimension d2 between the bonding portions is 3 mm. Let the stator cores of model numbers A8 to A14 be the models of the A2 group. In the model of the A2 group, the width dimension d1 of the bonding portion is 167% with respect to the space dimension d2 of the adjacent bonding portion. The width dimension d1 of the bonding portion of each model of the A2 group is 5 mm, and the spacing dimension d2 between the bonding portions is 3 mm. Let the stator cores of model numbers A15 to A21 be the models of the A3 group. In the model of the A3 group, the width dimension d1 of the bonding portion is 67% with respect to the space dimension d2 of the adjacent bonding portion. The width dimension d1 of the bonding portion of each model of the A3 group is 2 mm, and the space dimension d2 between the bonding portions is 3 mm. In the A1 group, the A2 group, and the A3 group, the angle α (refer to FIG. 4 ) formed by the first direction D1 and the rolling direction RD is 0°, 15°, 30°, 45°, 60°, 75° and 90° models.

Table 1 shows the simulation results of the iron loss of the electromagnetic steel sheet for each model. In addition, regarding the iron loss of each model, the value of the iron loss of the reference model (the stator core of the model number A22) was used as a reference, and it was expressed as a percentage. In addition, in Table 1, the following results are described: The result of the drop test was performed about the mock-up provided with the joint part similar to each model. In the drop test, each model was dropped 10 times from a height of 1 m. Evaluation A is a case where peeling of the adhesive portion did not occur after 10 drops. In addition, the evaluation A- shows that the peeling of the bonding portion did not occur after 5 drops, but the peeling occurred before 10 times.

[Table 1] model number Width dimension d1 / Interval dimension d2 Angle α [° ] Iron loss ratio [%] drop test Remark Group A 1 A1 233% 0° 96.661 A A2 233% 15° 96.695 A A3 233% 30° 96.593 A A4 233% 45° 96.525 A A5 233% 60° 96.457 A A6 233% 75° 96.354 A A7 233% 90° 96.252 A Group A 2 A8 167% 0° 95.843 A A9 167% 15° 95.741 A A10 167% 30° 95.639 A A11 167% 45° 95.537 A A12 167% 60° 95.434 A A13 167% 75° 95.366 A A14 167% 90° 95.332 A Group A 3 A15 67% 0° 92.572 A- A16 67% 15° 92.504 A- A17 67% 30° 92.334 A- A18 67% 45° 92.266 A- A19 67% 60° 92.164 A- A20 67% 75° 92.095 A- A21 67% 90° 92.129 A- A22 - - 100 - benchmark model

Comparing the stator cores of model No. A1 to model No. A21, the following situation has been confirmed: in any of the models belonging to the 1st to A3 groups, the first direction D1 and the rolling direction RD can be adjusted by The angle α of the configuration is set to 30° or more to suppress iron loss. In addition, it has been confirmed that the iron loss can be further suppressed by setting the angle α to be 60° or more.

If the A1 group, the A2 group and the A3 group are compared with each other, the iron loss of the model of the A3 group is the smallest. The model of group A3 is such that the width dimension d1 is 67% of the space dimension d2. That is, the model of the A3-th group is such that the width dimension d1 is smaller than the interval dimension d2. Therefore, it is considered that the strain of the electrical steel sheet 40 caused by the adhesive can be suppressed, and the magnetic properties of the stator core 21 can be ensured. In addition, it has been confirmed that when the width dimension d1 is set to 67% with respect to the interval dimension d2, the deterioration of the iron loss of the electrical steel sheet 40 can be suppressed. Even when the ratio of the width dimension d1 to the space dimension d2 is changed by about ±5%, the iron loss does not change much. Therefore, it can be said that even when the width dimension d1 is set to 67%±5% with respect to the interval dimension d2, the deterioration of the iron loss of the electrical steel sheet 40 can be suppressed.

After comparing the models in the A3 group, the stator core of the model number A20 in which the angle α formed by the first direction D1 and the rolling direction RD was set to 75° had the smallest iron loss. That is, it was confirmed that when the width dimension d1 is 67% of the interval dimension d2, the deterioration of the iron loss can be most suppressed by setting the angle α to 75°. Furthermore, even if the angle α is changed by about ±5°, the iron loss does not change much. In addition, even when the ratio of the width dimension d1 to the space dimension d2 is changed by about ±5%, the iron loss does not change much. Therefore, it can be said that when the width dimension d1 is 67%±5% with respect to the space dimension d2, the deterioration of the iron loss can be most suppressed by setting the angle α to 75°±5°.

The model of the A2 group is such that the width dimension d1 is 167% of the space dimension d2. After comparing the models in the A2 group, the stator core of the model number A14 in which the angle α formed by the first direction D1 and the rolling direction RD is 90° has the smallest iron loss. That is, it was confirmed that when the width dimension d1 is 167% with respect to the interval dimension d2, the deterioration of the iron loss can be most suppressed by setting the angle α to 90°. As described above, even if the angle α is changed by about ±5°, the iron loss does not change much. In addition, even when the ratio of the width dimension d1 to the space dimension d2 is changed by about ±5%, the iron loss does not change much. Therefore, it can be said that when the width dimension d1 is 167%±5% with respect to the space dimension d2, the deterioration of the iron loss can be most suppressed by setting the angle α to be 85° or more.

The model of group A1 is such that the width dimension d1 is 233% with respect to the space dimension d2. After comparing the models in the A1 group, the stator core of the model number A7 in which the angle α formed by the first direction D1 and the rolling direction RD is set to 90° has the smallest iron loss. That is, it was confirmed that when the width dimension d1 is 233% with respect to the space dimension d2, the deterioration of the iron loss can be most suppressed by setting the angle α to 90°. As described above, even if the angle α is changed by about ±5°, the iron loss does not change much. In addition, even when the ratio of the width dimension d1 to the space dimension d2 is changed by about ±5%, the iron loss does not change much. Therefore, it can be said that when the width dimension d1 is 233%±5% with respect to the interval dimension d2, the deterioration of the iron loss can be most suppressed by setting the angle α to be 85° or more.

As shown in Table 1, compared with the mock-up of the group A3, the mock-up of the group A1 and the mock-up of the group A2 are superior in fall strength. The physical models of the A1 group and the A2 group have the width dimension d1 of the bonding portion larger than the spacing dimension d2, while the physical model of the A3 group has the bonding portion width dimension d1 smaller than the spacing dimension d2. From this, it was confirmed that the bonding strength can be improved when the width dimension d1 of the bonding portion is larger than the spacing dimension d2 in the second direction D2 with the adjacent bonding portion.

Next, in addition to the above-mentioned models numbered A1 to A21, simulations were performed on models in which the width dimension d1/interval dimension d2 and the angle α were changed in a wide range. More specifically, it is prepared to change the width dimension d1/interval dimension d2 to 0%, 50%, 67%, 100%, 150%, 167%, 200%, 233%, 250%, 300%, and 350%, respectively. , 400%, 450%, and 500%, and change the angle α to a simulation model of 0°, 15°, 30°, 45°, 60°, 75°, and 90°, respectively, and calculate the iron loss. In addition, based on these simulation results, the threshold value of iron loss improvement was verified with respect to the reference model number A22 of the prior art.

8 is a graph showing the iron loss ratio with respect to the reference model number 22 by the gradation of the width dimension d1/interval dimension d2 on the horizontal axis and the angle α on the vertical axis. In FIG. 8 , the area where the grayscale density is shallow means that the iron loss has been improved (ie, the iron loss ratio is 100% or less) with respect to the reference model number A22.

As shown in FIG. 8 , when the width dimension d1/interval dimension d2 is 368% or less, regardless of the angle α, the iron loss can be improved compared to the reference model number A22 of the prior art. That is, it has been confirmed that the width dimension d1 of the bonding portion is preferably 368% or less with respect to the spacing dimension d2 in the second direction D2 of the adjacent bonding portion. The smaller the width dimension d1/interval dimension d2, the better the iron loss, and is preferably 233% or less, preferably 167% or less, and more preferably 67% or less.

>Second verification test> Next, as a second verification test, verification was performed on the split core exemplified as the second embodiment. As the models used for the simulation, stator cores (laminated cores) of model numbers B1 to B21 described below are assumed. The stator cores of model numbers B1 to B21 have a plurality of core pieces connected in the circumferential direction. The core blocks of each stator core are made of non-directional electromagnetic steel sheets with a thickness of 0.25mm. The shape of the electromagnetic steel sheet is the same as that shown in FIG. 6 , and the rolling direction RD of the electromagnetic steel sheet coincides with the extending direction of the teeth.

In the core blocks of model number B1 to model number B21, a plurality of bonding portions as shown in FIG. 6 are provided between the electromagnetic steel sheets. That is, in the core blocks of the model number B1 - the model number B21, a plurality of bonding portions extend in a band shape along the first direction D1.

Let the stator cores of model numbers B1 to B7 be the models of the B1 group. In the model of the B1 group, the width dimension d1 of the bonding portion is 150% with respect to the space dimension d2 of the bonding portion adjacent to each other. The width dimension d1 of the bonding portion of each model of the B1 group is 3 mm, and the spacing dimension d2 between the bonding portions is 2 mm. In the B1 group, the angle α (refer to FIG. 6 ) formed by the first direction D1 and the rolling direction RD is 0°, 15°, 30°, 45°, 60°, 75°, and 90°. The iron cores are set to the respective model numbers B1 to B7.

Let the stator cores of model numbers B8 to B14 be the models of the B2 group. In the model of the B2 group, the width dimension d1 of the bonding portion is 60% with respect to the space dimension d2 between the bonding portion and the adjacent bonding portion. The width dimension d1 of the bonding portion of each model of the B2 group is 3 mm, and the space dimension d2 between the bonding portions is 5 mm. In the B2 group, the angle α (refer to FIG. 6 ) formed by the first direction D1 and the rolling direction RD is 0°, 15°, 30°, 45°, 60°, 75°, and 90°. The iron cores were set to each model number B8 to number B14.

Let the stator cores of model numbers B15 to B21 be models of the B3 group. In the model of the B3 group, the width dimension d1 of the bonding portion is 43% with respect to the space dimension d2 of the adjacent bonding portion. The width dimension d1 of the bonding portion of each model of the B3 group is 3 mm, and the spacing dimension d2 between the bonding portions is 7 mm. In the B3 group, the angle α (refer to FIG. 6 ) formed by the first direction D1 and the rolling direction RD is 0°, 15°, 30°, 45°, 60°, 75°, and 90°. The iron core was set to each model B15 to number B21.

Moreover, as a comparison object, the iron loss of the stator core 121X of the model number B22 in which a plurality of non-oriented electrical steel sheets 140 were assembled in layers as shown in FIG. 9 was also obtained. The stator core 121X of the model number B22 is a model prepared for comparing the iron loss of the conventional structure and the present invention. Hereinafter, the stator core of the model number B22 will be referred to as a "reference model". The stator core 121X of the reference model has a plurality of core pieces 124X. The thickness of the electromagnetic steel sheet 140 of the stator core 121X of the standard model is 0.25 mm, and the rolling direction RD of the electromagnetic steel sheet is consistent with the extending direction of the teeth. The core blocks of the stator core 121X of the reference model are respectively provided with a first engagement piece C1 provided on the core back portion 122 , and two second engagement pieces C2 provided on the teeth portion 123 . The first clincher C1 is located at the center in the circumferential direction of the core back portion 122 . The two second clinchers C2 are arranged in the radial direction at the center of the tooth portion 123 in the circumferential direction. In the first surface of the electromagnetic steel sheet 140 , the ratio of the area occupied by the binding members C1 and C2 is about 3.2%.

For each model, the simulation results of the iron loss of the electromagnetic steel sheet are shown in Table 2. In addition, in Table 2, the following result is described in the drop test of the mock-up provided with the joint part similar to each model. The drop test was performed in the same procedure as the above-mentioned first verification test. In addition, the evaluation criteria of the drop test in this test are also the same as those of the first verification test.

In addition, the so-called iron loss suppression ratio Rt shown in Table 2 is the value obtained by dividing the difference between the iron loss of each model and the iron loss of the standard model (stator core of model number B22) by the iron loss of the standard model. Value expressed as a percentage. That is, the iron loss suppression rate in the table is represented by the following formula (1), when the iron loss of each model is W and the iron loss of the reference model is Worg.

[Formula 1]

[Table 2] model number Width dimension d1 / Interval dimension d2 Angle α [° ] Iron loss inhibition rate Rt [%] drop test Remark Group B 1 B1 150% 0° -6.9 A B2 150% 15° -7.2 A B3 150% 30° -7.5 A B4 150% 45° -7.9 A B5 150% 60° -8.0 A B6 150% 75° -7.8 A B7 150% 90° -8.3 A Group B 2 B8 60% 0° -7.5 A- B9 60% 15° -7.8 A- B10 60% 30° -7.8 A- B11 60% 45° -7.9 A- B12 60% 60° -8.1 A- B13 60% 75° -8.3 A- B14 60% 90° -8.5 A- Group B3 B15 43% 0° -7.5 A- B16 43% 15° -7.7 A- B17 43% 30° -8.0 A- B18 43% 45° -8.2 A- B19 43% 60° -8.2 A- B20 43% 75° -8.6 A- B21 43% 90° -8.9 A- B22 - - 0 - benchmark model

Comparing the stator cores of model number B1 to model number B21, the following situation can be confirmed: In any of the models belonging to the first to B3 groups, the first direction D1 and the rolling direction RD The formed angle α is set to 45° or more to sufficiently suppress the iron loss (until the iron loss suppression ratio Rt is -7.8% or less). In addition, it has been confirmed that the iron loss can be further suppressed (up to the iron loss suppression rate Rt being -7.9% or less) by setting the angle α to 60° or more.

Comparing Group B1, Group B2, and Group B3 with each other, the iron loss of the model of Group B2 is smaller than that of the model of Group B1, and the iron loss of the model of Group B3 is the smallest. The models of the B2-th group and the B3-th group are such that the width dimension d1 is smaller than the interval dimension d2. Therefore, it is considered that the strain of the electromagnetic steel sheet 140 caused by the adhesive can be suppressed, and the magnetic properties of the stator core 121 can be ensured. The width dimension d1 of the models in the B2 group is 60% of the space dimension d2, and the width dimension d1 of the models in the B3 group is 43% with respect to the space dimension d2. That is, the ratio of the width dimension d1 to the space dimension d2 is smaller in the model of the B3-th group than the model of the B2-th group. In the model of the B3 group, it has been confirmed that the deterioration of the iron loss of the electromagnetic steel sheet 140 can be suppressed more effectively than the model of the B2 group. That is, through this verification test, it has been confirmed that the iron loss can be suppressed when the width dimension d1 is 60% or less with respect to the space dimension d2, and the iron loss can be further suppressed when the width dimension d1 is 43% or less. damage.

Since the ratio of the width dimension d1 to the interval dimension d2 is different for each of the B1-th group, the B2-th group, and the B3-th group, the preferable ranges of the angles α are different from each other. The iron loss suppression rate Rt in Table 2 should preferably be set to -8% or less as a reference.

The model of group B1 is such that the width dimension d1 is 150% of the space dimension d2. When comparing the models in the B1 group, only the stator core of the model number B7 in which the angle α formed by the first direction D1 and the rolling direction RD was set to 90° had iron loss lower than -8%. That is, it was confirmed that when the width dimension d1 is 150% of the interval dimension d2, the deterioration of the iron loss can be most sufficiently suppressed by setting the angle α to 90°. Furthermore, even if the angle α is changed by about ±5°, the iron loss does not change much. In addition, even when the ratio of the width dimension d1 to the space dimension d2 is changed by about ±5%, the iron loss does not change much. Therefore, it can be said that when the width dimension d1 is 150%±5% with respect to the space dimension d2, the deterioration of the iron loss can be sufficiently suppressed by setting the angle α to be 85° or more.

The model of group B2 is such that the width dimension d1 is 60% of the space dimension d2. After comparing the models in the B2 group, in the stator cores of model numbers B12, 13, and 14 in which the angle α formed by the first direction D1 and the rolling direction RD is 60° or more, the iron loss is below -8%. That is, it was confirmed that when the width dimension d1 is 60% of the space dimension d2, the deterioration of the iron loss can be sufficiently suppressed by setting the angle α to 60° or more. As described above, even when the ratio of the width dimension d1 to the space dimension d2 is changed by about ±5%, the iron loss does not change much. Therefore, it can be said that when the width dimension d1 is 60%±5% with respect to the space dimension d2, the deterioration of the iron loss can be most sufficiently suppressed by setting the angle α to be 60° or more.

The model of group B3 is such that the width dimension d1 is 43% of the space dimension d2. After comparing the respective models in the B3 group, in the stator cores of model numbers B18, 19, 20, and 21 in which the angle α formed by the first direction D1 and the rolling direction RD is 45° or more, the iron The loss is less than -8%. That is, it was confirmed that when the width dimension d1 is 43% with respect to the space dimension d2, the deterioration of the iron loss can be sufficiently suppressed by setting the angle α to 45° or more. As described above, even when the ratio of the width dimension d1 to the space dimension d2 is changed by about ±5%, the iron loss does not change much. Therefore, it can be said that when the width dimension d1 is 43%±5% with respect to the space dimension d2, the deterioration of the iron loss can be most sufficiently suppressed by setting the angle α to be 60° or more.

As shown in Table 2, compared with the mockups of the B2 groups and B3 groups, the mockup of the B1 group is superior in the fall strength. The width dimension d1 of the bonding portion of the physical models of the B1 group is larger than the spacing dimension d2, and the width dimension d1 of the bonding portions of the physical models of the B2 and B3 groups is smaller than the spacing dimension d2. From this, it was confirmed that even in the split iron core, when the width dimension d1 of the bonding portion is larger than the spacing dimension d2 in the second direction D2 between the bonding portion and the adjacent bonding portion, the bonding can be improved. strength. industrial availability

According to the present invention, the magnetic properties can be improved. Accordingly, the industrial availability is great.

10, 110: Rotary Motors 20,120: Stator 21, 121, 121X: stator core 22,122: Core Back 23,123: Teeth 30: Rotor 31: rotor core 32: Permanent magnet 33: Through hole 40: Electromagnetic steel plate 41, 141, 241: Subsequent 42,142: Next area 43,143: Non-Following Area 50: Cover 60: Rotary axis 124, 124X: Core block 129: Fastening ring 140: Electromagnetic steel sheet 241c: Element Continuation C: convergent parts C1: The first convergence piece C2: The second convergence piece CL: Centerline d1: width dimension D1: 1st direction d2: Interval dimension D2: 2nd direction O: central axis RD: rolling direction SD: special direction VL: imaginary line α: angle

FIG. 1 is a cross-sectional view of a rotating electrical machine according to the first embodiment. Fig. 2 is a plan view of a stator provided with the rotating electrical machine according to the first embodiment. FIG. 3 is a front view of the stator provided with the rotating electrical machine according to the first embodiment. Fig. 4 is a schematic diagram of the electrical steel sheet and the bonding portion of the first embodiment. Fig. 5 is a plan view of the rotating electrical machine according to the second embodiment. Fig. 6 is a schematic diagram of an electrical steel sheet and a bonding portion of the second embodiment. FIG. 7 is a schematic diagram of a connecting portion of a stator of a modified example. FIG. 8 is a graph showing the ratio and angle of iron loss with respect to the width dimension and the space dimension of the bonding portion in the first verification test. 9 is a plan view of a stator core serving as a reference model for iron loss simulation in the second verification test, and is a plan view showing a state in which electromagnetic steel sheets are spliced and joined.

20: Stator

21: stator core

22: Core back

23: Teeth

40: Electromagnetic steel plate

41: The Second Part

42: Next area

43: Non-connected area

d1: width dimension

D1: 1st direction

d2: Interval dimension

D2: 2nd direction

O: central axis

RD: rolling direction

SD: special direction

α: angle

Claims (28)

A laminated core comprising: a plurality of electromagnetic steel sheets stacked on each other; and a plurality of bonding portions arranged between the electromagnetic steel sheets adjacent to each other in the direction of lamination, respectively bonding the electromagnetic steel sheets to each other, and from the above Viewed from the lamination direction, the plurality of bonding portions are formed in the shape of strips each extending in the first direction, and the plurality of bonding portions are mutually aligned and arranged in a second direction orthogonal to the first direction, the first direction The angle formed with the rolling direction of the electrical steel sheet is 30° or more and 90° or less. The laminated core according to claim 1, wherein the angle formed by the first direction and the rolling direction of the electrical steel sheet is 52.3° or more. The laminated iron core according to claim 1 or 2, wherein the width dimension of the bonding portion is smaller than the interval dimension between the bonding portion and the adjacent bonding portion in the second direction. The laminated iron core according to claim 3, wherein the width dimension of the bonding portion is 67%±5% with respect to the spacing dimension of the bonding portion adjacent to the bonding portion in the second direction. The laminated core according to claim 4, wherein the angle formed by the first direction and the rolling direction of the electrical steel sheet is 75°±5°. The laminated iron core according to claim 1 or 2, wherein the width dimension of the bonding portion is larger than the interval dimension of the bonding portion adjacent to the bonding portion in the second direction. The laminated iron core according to claim 6, wherein the width dimension of the bonding portion is 167%±5% relative to the spacing dimension of the bonding portion adjacent to the bonding portion in the second direction, and the first direction is the same as the electromagnetic steel sheet. The angle formed by the aforementioned rolling direction is 85° or more. The laminated iron core according to claim 6, wherein the width dimension of the bonding portion is relative to the The interval dimension of the adjacent bonding portions in the second direction is 233%±5%, and the angle formed by the first direction and the rolling direction of the electrical steel sheet is 85° or more. The laminated iron core according to claim 1, wherein the average thickness of the bonding portion is 1.0 μm to 3.0 μm. The laminated iron core according to claim 1, wherein the average tensile modulus of elasticity E of the bonding portion is 1500 MPa to 4500 MPa. The laminated iron core of claim 1, wherein the bonding portion is a room temperature bonding acrylic bonding agent containing SGA composed of an acrylic bonding agent containing an elastomer. An iron core block which constitutes a laminated iron core by connecting a plurality of pieces annularly, wherein the iron core block comprises: a plurality of electromagnetic steel sheet sheets stacked on each other; The electromagnetic steel sheets are bonded to each other, and the plurality of bonding portions are formed in a strip shape each extending in the first direction when viewed from the lamination direction, and the plurality of bonding portions They are mutually aligned and arranged in a second direction orthogonal to the first direction, and the angle formed between the first direction and the rolling direction of the electrical steel sheet is 45° or more and 90° or less. The core block according to claim 12, wherein the angle formed by the first direction and the rolling direction of the electromagnetic steel sheet is 52.3° or more. The core block according to claim 12 or 13, comprising an arc-shaped core back, and teeth protruding from the core back in the radial direction of the core back, the teeth extending along the rolling direction. The iron core block according to claim 12, wherein the width dimension ratio of the aforesaid connecting portion is the same as that of the adjacent portion. The space between the bonding portions in the second direction is smaller. The core block according to claim 15, wherein the width dimension of the bonding portion is 60% or less relative to the spacing dimension of the bonding portion adjacent to the bonding portion in the second direction. The core block according to claim 16, wherein the width dimension of the bonding portion is 43% or less relative to the spacing dimension of the bonding portion adjacent to the bonding portion in the second direction. The iron core block according to claim 16, wherein the width dimension of the bonding portion is 43%±5% relative to the spacing dimension of the adjacent bonding portion in the second direction, and the first direction and the electromagnetic steel sheet are 43%±5%. The angle formed by the aforementioned rolling direction is 45° or more. The iron core block according to claim 15, wherein the width dimension of the bonding portion is 60%±5% relative to the spacing dimension of the bonding portion adjacent to the bonding portion in the second direction, and the first direction and the electromagnetic steel sheet are The angle formed by the aforementioned rolling direction is 60° or more. The iron core block according to claim 12, wherein the width dimension of the connecting portion is larger than the interval dimension of the adjacent connecting portion in the second direction. The core block according to claim 20, wherein the width dimension of the bonding portion is 150%±5% relative to the spacing dimension of the adjacent bonding portion in the second direction, and the first direction and the electromagnetic steel sheet are 150%±5%. The angle formed by the aforementioned rolling direction is 85° or more. The iron core block according to claim 12, wherein the average thickness of the bonding portion is 1.0 μm˜3.0 μm. The iron core block according to claim 12, wherein the average tensile modulus of elasticity E of the bonding portion is 1500 MPa to 4500 MPa. The core block according to claim 12, wherein the bonding portion is a room temperature bonding acrylic bonding agent containing SGA composed of an acrylic bonding agent containing an elastomer. A laminated iron core is formed by connecting a plurality of iron core pieces according to any one of claims 12 to 24 in a ring shape. A rotating electrical machine including the laminated iron core according to any one of claims 1 to 11 and 25. A method for manufacturing an iron core block, comprising the steps of: a first step of punching out a plurality of electromagnetic steel sheet pieces from an electromagnetic steel sheet; and a second step of laminating while providing a bonding portion between the plurality of the aforementioned electromagnetic steel sheet pieces Furthermore, in the first step, the electromagnetic steel sheet is punched so that the tooth portions extend along the rolling direction of the electromagnetic steel sheet, and in the second step, the plurality of bonding portions are formed so as to be viewed from the lamination direction. In strips each extending in the first direction, a plurality of the bonding portions are mutually aligned and arranged in a second direction orthogonal to the first direction, and a plurality of the electromagnetic steel sheets are laminated in the first direction The angle formed with the rolling direction is 45° or more and 90° or less. The method for manufacturing an iron core block according to claim 27, wherein the width dimension of the bonding portion is smaller than the interval dimension between the bonding portion and the adjacent bonding portion in the second direction.

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